Regain direct access to Time Machine backups from old/other computer.

reset_permissions_on_time_machine.sh

# USAGE: reset_permissions_on_time_machine TIMEMACHINE_HD_NAME OLD_COMPUTER_NAME
function reset_permissions_on_time_machine(){
echo

TIMEMACHINE_HD_NAME="$1"
OLD_COMPUTER_NAME="$2"

if [ -z "$TIMEMACHINE_HD_NAME" ]; then
  echo "USAGE: reset_permissions_on_time_machine TIMEMACHINE_HD_NAME OLD_COMPUTER_NAME"
  echo "Choose the name of the Time Machine disk:"
  ls -1 /Volumes/
  echo
  return 1
fi

if [ -z "$OLD_COMPUTER_NAME" ]; then
  echo "USAGE: reset_permissions_on_time_machine TIMEMACHINE_HD_NAME OLD_COMPUTER_NAME"
  echo "Choose the name of the computer's backups to reset:"
  ls -1 "/Volumes/$TIMEMACHINE_HD_NAME/Backups.backupdb/"
  echo
  return 1
fi

echo "sudo chmod -R -N '/Volumes/$TIMEMACHINE_HD_NAME/Backups.backupdb/$OLD_COMPUTER_NAME'"
sudo chmod -R -N "/Volumes/$TIMEMACHINE_HD_NAME/Backups.backupdb/$OLD_COMPUTER_NAME"

#
# TODO: why does this produce a few errors like this: ?
# chmod: Failed to clear ACL on file xxxxxx.jpg: Operation not permitted
#

echo && echo "Complete." && echo

}
reset_permissions_on_time_machine "$@"